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Temp Rising
Have been reading these forums for a long time. Lot of good info.
Here is my issue: The other day we made a 385 mile trip home from Florida to Ga. On the way I noticed the digital temp was running around 215 degrees for the last 3 hours of the trip. It normally runs between 195 and 205 degrees. I don’t think the dash needle reflected the temp being that high. Need to make another trip back to FL next week. Is there anything I can check? Coolant level is good. Belts appear tight. Maybe the fan clutch?
Thanks for any input. -
21 Replies
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Ron,
The first thing that I would do is clean the radiator. If it looks dirty use the extra strength Simple Green that will not react to aluminum. Spray generously and then wash out with a hose but don’t use a high pressure nozzle as you don’t want to bend the fins.
That would be my first step.
Good luck.
Mark
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Ron
If your talking about your pro driver readings versus your needle gage for coolant temperature you need to make sure your monitoring the right component.
look in your book to make sure that is the temperature and not oil temp or trans temp.The symbols on the pro driver are confusing.
Later
bv -
Thanks Mark.
Just cleaned it a few months ago. I’m pretty much OCD on keeping the coach clean and having maintenance performed.Back in 2008 our local Detroit shop replaced the sensor that kicks in the fan. Can’t remember what the actual name of the part was. At the time, it was showing about the same higher temps as we experienced on the way home. Took care of the issue at that time. Also, Prevost JAX replaced fan clutch assembly about 4 years ago.
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Bernie,
Definitely it was the water temp. I usually keep it on the water temp when traveling. Easy to see if it’s trending up. You are right about the symbols being a little confusing.
Thanks -
The analog gauge and digital message center information should track one another because I believe they are both generated by DDEC.
To verify if the fan clutch is the issue because I would choose to not ignore the 215 degree reading I would suggest you engage the fan clutch electrically and see if the temps change. If the engine does not rise to the 215 degree level it is likely the fan clutch or its relays may be the issue.
This thread may help you understand the process. You can verify the relay numbers by checking the diagram for your rear electric box
http://prevostcommunity.com/forum/threaddetails.asp?Category=Chassis&ThreadID=1582
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I’m confused. How can the analog and digital track one another? My book states the MCD displays trans fluid temp, engine oil temp and battery voltage. No water temp displayed. This is on a 2004/05 Marathon. Do some of these MCD displays actually display the water temp?
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Ronnie,
Is your high speed fan coming on?
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Before Ron starts locking the fan in we need to verify what gauge and component he is talking about.
The Pro Driver or MCD display does not monitor water temp on mine, that is what Jacky is asking. The highlighted yellow symbol is not water temp.
Later
bv
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Ron G., if you are seeing relatively constant temps on your digital display or gauge, regardless of what the temp is, that gauge is likely showing oil temp. or trans temp. Those fluids hold relatively constant temperatures as compared to coolant. The coolant temp. varies much more, up and down, within its range. Coolant temp. changes based on even small hills and events of accelleration or retarder use, and of course the cycling of the fan. Even if the fan clutch is not going to high speed, it would be very unusual for your coolant temp to remain at a constant temp.
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I have never seen a pro driver panel display coolant temp , it shows what Bernie said
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Smarter guys than me realized the coolant temp is not on the display.
But I disagree that the transmission oil temp and coolant temps don’t track one another except when the retarder if equipped is in use.
215 is not a high temp for the transmission, but I would be more c omfortable if it ran around 205 when the retarder is not in use. If it seems high, check fluid levels using the shifter touch pad. Sometimes an overfull fluid runs the temps up.
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Thanks for the input. We are out of town for a while. When we return I will check the display manual.
This could end up being a very embarassing post for me. We have owned many RVs over the last 34 years and have owned this one since late 2007.
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What Bernies paper says is motor oil temp ,Trans temp , then battery voltage
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If it is trans temp, I have not ever seen it that high. In our two Foretravels, we had retarders and would ocassionally see the transmission temp rise on a long decent. We now have a two position engine brake.
Thanks
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The one Bernie highlighted is the one that I have apparently wrongly assumed was water temp.
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